Sanyo-kokusaku Pulp Co., Ltd.

Masao Matsukawa

Norikazu Kasamatsu

Hisashi Mino

Masaru Mishima

Hirokazu Hirata

Minematsu Nagashima

Yoshihiro Kuroyama

Yoshio Yoshida

Teruhisa Shimada

An ink fusion transfer paper having a recording layer comprising at least one layer on a support, this paper being characterized in that the uppermost layer of the recording layer consist of at least 100 parts by weight of a pigment and 10-50 parts by weight of a binder, the layer being applied to one or both sides of the support at a rate of 5-50 g/m, per side in terms of dry solids, 30-100 weight percent of the aforesaid pigment consist of a synthetic silica having a specific surface of 20-600 m.sup.2 /g, and the 75 degree gloss of the aforesaid uppermost layer of the paper is no less than 50%.

Paper suitable for ink fusion transfer type thermal printer and copiers,

A heat-sensitive recording material comprises a sheet substrate applied thereon with a heat-sensitive, color-developing layer containing as the main components a colorless or light-colored leuco dye, a developer for permitting said dye to develop a color by heating and a binder, in which the binder used is an ammonium salt of a diisobutylene/maleic anhydride copolymer is expressed in terms of the following general formula: ##STR1## wherein R stands for a diisobutylene group a part of said ammonium salt being substituted and modified by an ammonium salt comprising a primary, secondary or tertiary ethanol amine.

Heat-sensitive recording materials

A heat-sensitive recording material is disclosed, comprising a support having thereon a heat-sensitive, color-forming layer mainly composed of as color-forming components a colorless or pale-colored leuco dye and an acidic compound capable of allowing said leuco dye to color develop by heating, wherein said heat-sensitive, color-forming layer comprises a color former comprising a fluoran derivative represented by the following general formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represents a lower alkyl group, and X represents a halogen atom, a lower alkyl group, a cyano group, or a nitro group, a developer comprising bis(p-hydroxyphenyl)sulfone or a derivative thereof represented by the following general formula (II): ##STR2## wherein R.sub.3 and R.sub.4 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, a phenoxy group, a carbonyl group, a nitro group, or a cyano group, and a binder comprising an ammonium salt of a diisobutylene/maleic anhydride copolymer and a styrene/butadiene copolymer. The heat-sensitive recording material of the present invention is good in preservability.

Heat-sensitive recording material

A heat-sensitive recording material composed of a heat-sensitive, color-forming layer on a sheet substrate. The heat-sensitive, color-forming layer is mainly composed of a color-forming component consisting of a colorless or light-colored leucodye and an acidic compound for allowing said leucodye to develop color by heating, and further includes on the upper surface thereof a protective layer composed mainly of a polyvinyl alcohol and containing an epoxy compound having in its molecule at least two epoxy groups or an ethylenimine compound having in its molecule at least two ethylenimine groups.

A heat-sensitive recording material having a heat-sensitive layer composed mainly of a leuco dye, a phenolic compound and a water-soluble binding agent is characterized in that a combination of bisphenol A and p-phenylphenol is applied as the developer in a ratio by weight between 10:1 and 1:1, preferably 7:1 and 1:1.

A heat-sensitive recording material having a heat-sensitive layer composed mainly of a leuco dye and a phenolic compound used as a developer, said heat-sensitive layer containing as a binding agent any one or combinations of polyvinyl alcohol, oxidized starch and etherized starch, and methyl cellulose in a ratio by weight between 98:2 and 90:10.

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Tokyo, Japan

Masao Matsukawa